<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar fixed left-arrow @click-left="$router.back()" title="文章详情"></van-nav-bar>
    <!-- 加载中 -->
    <van-loading class="article-loading" v-show="loading" />
    <!-- 文章详情 -->
    <div class="error" v-if="is404">文章没露</div>
    <div class="detail" v-else>
      <h3 class="title">{{article.title}}</h3>
      <div class="author">
        <van-image round width="1rem" height="1rem" fit="fill" />
        <div class="text">
          <p class="name">{{article.aut_name}}</p>
          <p class="time">{{article.pubdate | relativeTime}}</p>
        </div>
        <van-button
          round
          size="small"
          type="info"
          @click="hSwitchFollow"
        >{{article.is_followed? '取消关注':'+ 关注'}}</van-button>
      </div>
      <div class="content" v-html="article.content">
        <!-- 正文部分 -->
      </div>
      <van-divider>END</van-divider>
      <div class="zan">
        <van-button
          round
          size="small"
          hairline
          type="primary"
          @click="hSwitchLike"
          plain
          :icon="article.attitude === 1 ? 'good-job':'good-job-o'"
        >{{article.attitude === 1?'取消点赞':'点赞'}}</van-button>&nbsp;&nbsp;&nbsp;&nbsp;
        <van-button
          round
          size="small"
          hairline
          type="danger"
          @click="hSwitchDisLike"
          plain
          icon="delete"
        >{{article.attitude === 0 ? '取消不喜欢' : '不喜欢'}}</van-button>
      </div>
    </div>
    <!-- /文章详情 -->
    <!-- 文章评论start -->
    <article-comment :articleId="$route.params.id"></article-comment>
    <!-- 文章评论end -->
  </div>
</template>

<script>
import { getArticleNews, addLike, deleteLike, addDisLike, deleteDisLike } from '@/api/article.js'
import { unFollowUser, followUser } from '@/api/user'
import ArticleComment from '@/views/article/comment.vue'
export default {
  name: 'article',
  data () {
    return {
      is404: false,
      loading: true,
      article: {}
    }
  },
  components: {
    ArticleComment
  },
  created () {
    this.loadArticle()
  },
  methods: {
    // 根据id获取文章详情
    async loadArticle () {
      try {
        const result = await getArticleNews(this.$route.params.id)
        console.log(result)
        // 保存文章详情
        this.article = result.data.data
        // 取消加载状态
        this.loading = false
      } catch (err) {
        this.loading = false
        if (err && err.response && err.response.status === 404) {
          // 确定文章没有找到
          this.is404 = true
        } else {
          this.$toast.fail('文章加载失败')
        }
      }
    },
    // 关注和取消关注
    async hSwitchFollow () {
      try {
        // 根据当前的关注状态决定接口调用
        if (this.article.is_followed) {
          // 取消关注
          await unFollowUser(this.article.aut_id)
        } else {
          await followUser(this.article.aut_id)
        }
        this.$toast.success('操作成功')
      } catch (err) {
        console.log(err.message)
        this.$toast.fail('操作失败')
      }
    },
    // 点赞和取消点赞
    async hSwitchLike () {
      if (this.article.attitude === 1) {
        await deleteLike(this.article.art_id.toString())
      } else {
        await addLike(this.article.art_id.toString())
      }
      this.$toast.success('操作成功')
      // 更新视图
      this.article.attitude = this.article.attitude * -1
    },
    // 喜欢和不喜欢
    async hSwitchDisLike () {
      // 根据当前attitude来决定调用哪一个方法：
      // 如果attitude是0，即当前给文章 添加了 不喜欢，则点击动作就是要 取消 不喜欢
      if (this.article.attitude === 0) {
        await deleteDisLike(this.article.art_id.toString())
        this.article.attitude = -1
      } else {
        await addDisLike(this.article.art_id.toString())
        this.article.attitude = 0
      }
      this.$toast.success('操作成功')
    }
  }
}
</script>

<style scoped lang='less'>
.article-container {
  position: absolute;
  left: 0;
  top: 0;
  overflow-y: scroll;
  width: 100%;
  height: 100%;
}
.article-loading {
  padding-top: 100px;
  text-align: center;
}
.error {
  padding-top: 100px;
  text-align: center;
}
.detail {
  padding: 50px 10px;
  .title {
    font-size: 16px;
  }
  .zan {
    text-align: center;
  }
  .author {
    padding: 10px 0;
    display: flex;
    .text {
      flex: 1;
      padding-left: 10px;
      line-height: 1.3;
      .name {
        font-size: 14px;
        margin: 0;
      }
      .time {
        margin: 0;
        font-size: 12px;
        color: #999;
      }
    }
  }
  .content {
    font-size: 14px;
    overflow: hidden;
    white-space: pre-wrap;
    word-break: break-all;
    /deep/ img {
      max-width: 100%;
      background: #f9f9f9;
    }
  }
}
</style>
